What are common symptoms of anaphylaxis?

Anaphylaxis is a severe, potentially life-threatening allergic reaction that typically occurs rapidly after exposure to an allergen. The correct choice highlights an array of symptoms that are characteristic of this condition. Wheezing is a common respiratory symptom resulting from bronchospasm and the constriction of the airways, making it difficult to breathe. Edematous lips and swelling, commonly referred to as angioedema, indicate the swelling of tissues, particularly in the face and throat, which can further compromise airway patency and lead to difficulty in swallowing or speaking. The occurrence of bronchospasm reflects the tightening of the muscles around the airways, which is critical in anaphylactic reactions and contributes to respiratory distress.

Other options present symptoms that are not typically associated with anaphylaxis. For instance, fever, chills, and fatigue are more indicative of infections or inflammatory responses rather than an acute allergic reaction. Symptoms like nausea, vomiting, and headache, while they can occur in various medical scenarios, are not definitive markers of anaphylaxis. Dark urine and back pain are not symptoms linked to anaphylaxis and are more commonly associated with kidney issues or dehydration. Understanding the distinct symptoms of anaphylaxis is essential for recognizing and responding to this medical emergency effectively.